How do I straighten the bent front frame on a Mazda RX-7 FD?

If you are dealing with uneven alignment—such as being unable to match negative camber side-to-side—you may actually be dealing with a shifted front subframe rather than a bent frame. You can verify whether the frame itself is bent by measuring from multiple spots on the front frame directly to the ground; if the measurements are equal on both sides, your frame is likely straight ¹.

If the frame is straight but the subframe has shifted, you can re-center it using the following steps:

1. Loosen the motor mount bolts.
2. Loosen the front subframe bolts.
3. Manually shift the subframe side-to-side and front-to-back, taking measurements until it is perfectly centered before tightening everything back down ¹.

To help ensure exact alignment, you can also install FD-specific subframe collars. These collars take up the slop around the mounting bolts and automatically center the subframe during installation ¹.